单项选择题

Reducing population growth improve both ______ of people and the environment.

A．health
B．the health
C．healths
D．the healthy
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单项选择题
By 1900 the American automobile age had begun--12 companies produced a ______ of more than 4,000 cars.
A．number
B．quantity
C．total
D．whole
单项选择题
The new manager had many difficulties to overcome but he took them all in his ______.
A．step
B．position
C．stride
D．duty
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